Move tests off Travis CI to another CI deployment

[lae]

Leaving this as a placeholder for myself, maybe I'll get around to it eventually. Last I checked Travis CI limitations aren't really favorable to me, so I'd like to move off (especially now that .org has been shutdown). Although, it's possible I could use my student status to get extra quota or something on travis-ci.com—I should look into that.

Ideally though I will have stood up a Drone CI (or at least that's what I've been leaning towards for a few years) deployment in my homelab that we can use for testing this role, and once that happens I can write a drone.yml definition + update the tests directory as necessary to run tests against PRs as well as regularly against the main branches (to find any upstream breakage).